摘要
以数值模拟和实验验证相结合的方法研究了三维动态混合对流过程中的温度场发展规律,并定量地分析了在Re=1×10~5,Cr=±3.36×10^(12),Pr=0.7,L/H=3/4条件下矩形腔体内温度均匀性的动态变化特性。研究结果表明,对于相同大小的Grashof数和Reynolds数,当Gr>0时,腔体内有着更高的升/降温速率,而其升/降温过程中的整体温度不均度则高于Gr<0时的换热过程。当Gr>0时,竖直方向的温度不均匀度是影响腔体内温度均匀性的主导因素(σ_(竖直)》σ_(水平));而当Gr<0时,竖直方向和水平方向上的温度不均匀度共同影响腔体内的温度均匀性(σ_(竖直)≈σ_(水平))。
The temperature uniformity characteristics of dynamic mixed convection flow in a three dimensional open cavity is investigated both numerically and experimentally.The results show that the heating/cooling rate is higher for Gr > 0 than that of Gr < 0,whereas the temperature uniformity in the dynamic process is lower for Gr > 0.The deviation of the temperature in the vertical direction is the dominant factor that affects the temperature uniformity for Gr > 0.In contrast,for Gr < 0,the deviation of the temperature in the horizontal direction has a comparative effect with that in the vertical direction on the temperature uniformity.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2014年第4期730-734,共5页
Journal of Engineering Thermophysics
基金
高等学校博士学科点专项科研基金项目(No.20120073110044)
关键词
混合对流
浮升力
温度均匀性
动态模拟
实验验证
mixed convection
buoyancy
temperature uniformity
dynamic simulation
experimental verification